Question

If you multiply me by 2, I become a number greater than 20 and less than 40 who am I

Answer 1

well there are many numbers, starting from 11 though 19.
11 times 2 = 22 12 times 2 = 24 13 times 2 = 26 14 times 2 = 28 15 times 2 = 30 16 times 2 = 32 17 times 2 = 34 18 times 2 = 36 19 times 2 = 38
so basically from any number from 11 through 19.
Hope i helped! :D